package HashMaptest;


import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.Consumer;

public class test1 {
    public static void main(String[] args) {
         /*
        需求：创建一个HashMap集合，键是学生对象(Student)，值是籍贯(String)。
        存储三个键值对元素，并遍历
        要求：同姓名，同年龄认为是同一个学生

        核心点：
            HashMap的键位置如果存储的是自定义对象，需要重写hashCode和equals方法。
       */


        //1.创建HashMap的对象
        HashMap<Student,String> hm = new HashMap<>();

        //2.创建三个学生对象
        Student s1 = new Student("zhangsan",23);
        Student s2 = new Student("lisi",24);
        Student s3 = new Student("wangwu",25);
        Student s4 = new Student("wangwu",25);

        //3.添加元素
        hm.put(s1,"江苏");
        hm.put(s2,"浙江");
        hm.put(s3,"福建");
        hm.put(s4,"山东");

        Set<Map.Entry<Student, String>> entries = hm.entrySet();
        entries.forEach(studentStringEntry-> {
                Student key = studentStringEntry.getKey();
                String value = studentStringEntry.getValue();
                System.out.println(key+"="+value);
            });

        hm.forEach(( key,  value) -> System.out.println(key+"="+value));

    }

}
